\begin{table}[H]
\centering
\caption{Block sizes, treatment probabilities and responses rates by treatment assignment} 
\label{tab:randomization}
\resizebox{\textwidth}{!}{ \begin{tabular}{lccccc}
  \hline \multicolumn{2}{l}{} & \multicolumn{1}{c}{\shortstack{With Facebook\\ account}} & \multicolumn{1}{c}{\shortstack{Only with WhatsApp \\account}} \\ \cmidrule(l{2pt}r{2pt}){3-3} \cmidrule(l{2pt}r{2pt}){4-4} Treatment & Baseline & \multicolumn{1}{>{\centering}p{2cm}}{Treatment probability} & \multicolumn{1}{>{\centering}p{2cm}}{Treatment probability} & \multicolumn{1}{>{\centering}p{1cm}}{Endline} & \multicolumn{1}{>{\centering}p{2cm}}{Response rate} \\ 
  \hline Control & 1104 & 1/5 & 1/5 & 839 & 0.76 \\ 
  Facebook & 565 & 3/5 & 0 & 418 & 0.74 \\ 
  WhatsApp Individual & 1118 & 1/5 & 1/5 & 824 & 0.737 \\ 
  WhatsApp Group & 1879 & 0 & 2/5 & 1382 & 0.735 \\ 
  TV Show Reminder & 952 & 0 & 1/5 & 702 & 0.737 \\ 
   \hline \hline Total & 5618 &  &  &  &  \\ 
   \hline \end{tabular}}
\justify {\footnotesize \textit{Notes:} We block randomized treatment assignment separately according to whether we could identify the Facebook account of the baseline survey respondent. 
          Blocks are of size 10 when Facebook accounts are available, and of size 50 when only WhatsApp accounts are available.” } \end{table}
 
